I was thinking it was more of an aggressive way of getting an open invitation to yell at people who misuse the button. Predict something wrong about their humour and you're going to the firing line almost immediately. It's a genius filter to get through all the smart ass pricks on your doorstep faster.

We had someone pretty much like this. She stopped ordering one day, we aren't sure if she died or moved to a nursing home but she wasn't at that house anymore. She was sweet but it took forever playing find the credit card with her since she was nearly blind.